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<a href="error__fwd_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="util__fwd_8hpp.html">flow/util/util_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &quot;<a class="code" href="common_8hpp.html">flow/common.hpp</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment"></span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="comment">/**</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment"> * Flow module that facilitates working with error codes and exceptions; essentially comprised of niceties on top</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="comment"> * boost.system&#39;s error facility.  As of this writing, we feel the latter facility is fantastic and quite complete;</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment"> * so as of this writing flow::error is intended to contain only minor syntactic-sugary items.</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment"> *</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment"> * @note Flow uses the convention wherein error-related facilities of a particular Flow module X (in</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment"> *       `namespace flow::X`) -- especially in particular X&#39;s dedicated error code set, if any -- are to reside</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment"> *       in `namespace flow::X::error`, mirroring the naming of up-one-level-from-that `flow::error`.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment"> *</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment"> * @see flow::Error_code whose doc header introduces the error-emission conventions used in all Flow modules.</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment"> */</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1error.html">flow::error</a></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>{</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment">// Find doc headers near the bodies of these compound types.</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span> </div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="keyword">class </span>Runtime_error;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span> </div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment">// Free functions.</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment"></span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment">/**</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> * Helper for FLOW_ERROR_EXEC_AND_THROW_ON_ERROR() macro that does everything in the latter not needing a preprocessor.</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"> * Probably not to be called except by that macro.</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"> *</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment"> * This function is the meat of it.  I omit details, since they are explained in FLOW_ERROR_EXEC_AND_THROW_ON_ERROR()</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> * doc header.  The present function does what is described therein -- except for preprocessor-requiring actions:</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"> *</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment"> * Preprocessor is needed to (1) supply halfway-decent &quot;context&quot; (file/line #/etc.) info to the</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment"> * exception object; and (2) to trigger the invoker of the macro (the actual user-facing API or very close to it)</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"> * to return XYZ to *its* caller (user code or very close to it).  So this function cannot do that, but instead it</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * respectively (1) takes the context string as an argument; and (2) returns `true` if and only if the invoker of the</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * macro should in fact immediately return the value `*ret`, where `ret` is an &quot;out&quot; argument</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment"> * to the present function.</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment"> *</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment"> * @note ATTENTION!  This is a (rare) case where documentation is more complicated than just looking at the</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"> *       implementation.  This embarrassingly verbose doc header is sort of a pedantic formality in this particular</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment"> *       (rare) case and is probably not worth reading for most people.</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"> * @tparam Func</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"> *         Any type such that given an instance `Func f`, the expression `r = f(&amp;e_c)` is valid,</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> *         assuming `e_c` is an #Error_code, and `r` is a `Ret`.  In practice, this is usually the insane</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"> *         type of whatever concoction lambda or `bind()` conjures out of a plain, hard-working method like</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment"> *         Peer_socket::send() and a bunch of innocent, API user-originated arguments thereto.</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> * @tparam Ret</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> *         The return type of the operation `func()`.  Should equal `ARG_ret_type` of</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> *         FLOW_ERROR_EXEC_AND_THROW_ON_ERROR().</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> * @param func</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> *        The operation, with the return type and argument as described above in `Func` template argument doc,</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> *        that performs whatever possibly error-generating actions are being wrapped by all this; and returns</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment"> *        whatever value is intended for the ultimate API caller.  The `Error_code*` passed into `func()` will NOT be</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> *        null; thus `func()` must NOT throw Runtime_error on error.</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> * @param ret</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"> *        Non-null pointer to a value into which the present function will place the return value of `func()`, if</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment"> *        indeed it executes the latter (and thus `true` is returned).</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment"> * @param err_code</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"> *        Null; or non-null pointer to an error code in memory; probably originating from the API caller.</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment"> *        `*err_code` is set if and only if `err_code` was non-null; and `func()` was executed (thus `true` returned);</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment"> *        and `func()` encountered an error.</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment"> * @param context</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment"> *        Value suitable for the `context` argument of Runtime_error constructor.</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment"> *        Most likely this should be something it takes little to no runtime computation to obtain;</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment"> *        so either your own string literal; or FLOW_UTIL_WHERE_AM_I_LITERAL().</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment"> * @return `true` if and only if `err_code` is null; and therefore `func()` was called.</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment"> *         `false` otherwise (i.e., `err_code` is not null; nothing was done; and the caller should perform the</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment"> *         equivalent of `func()` while safely assuming `*err_code` may be assigned to upon error).</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment"> */</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Func, <span class="keyword">typename</span> Ret&gt;</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceflow_1_1error.html#aa3708bdd4ceb1a6c801f3d4a1fc10f6d">exec_and_throw_on_error</a>(<span class="keyword">const</span> Func&amp; func, Ret* ret,</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>                             <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>* err_code, <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a> context);</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment"></span> </div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment">/**</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment"> * Equivalent of exec_and_throw_on_error() for operations with `void` return type.  Unlike the latter function,</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment"> * however, the present function is to be used directly as opposed to via macro.</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment"> *</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment"> * @tparam Func</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment"> *         Any type such that given an instance `Func f`, the expression `f(&amp;e_c)` is valid,</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment"> *         assuming `e_c` is an #Error_code.</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment"> * @param func</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment"> *        The operation, with the return type `void` and argument as described above in `Func` template argument doc,</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment"> *        that performs whatever possibly error-generating actions are being wrapped by all this.</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment"> *        The `Error_code*` passed into `func()` will NOT be null; thus `func()` must NOT throw Runtime_error on error.</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment"> * @param err_code</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment"> *        See exec_and_throw_on_error().</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment"> * @param context</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment"> *        See exec_and_throw_on_error().</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment"> * @return See exec_and_throw_on_error().</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment"> */</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Func&gt;</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceflow_1_1error.html#a48afa7f8c2e100acd461365dfb00a114">exec_void_and_throw_on_error</a>(<span class="keyword">const</span> Func&amp; func, <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>* err_code, <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a> context);</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span> </div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>} <span class="comment">// namespace flow::error</span></div>
<div class="ttc" id="acommon_8hpp_html"><div class="ttname"><a href="common_8hpp.html">common.hpp</a></div></div>
<div class="ttc" id="anamespaceflow_1_1error_html"><div class="ttname"><a href="namespaceflow_1_1error.html">flow::error</a></div><div class="ttdoc">Flow module that facilitates working with error codes and exceptions; essentially comprised of niceti...</div><div class="ttdef"><b>Definition:</b> <a href="error_2error_8cpp_source.html#l00021">error.cpp:22</a></div></div>
<div class="ttc" id="anamespaceflow_1_1error_html_a48afa7f8c2e100acd461365dfb00a114"><div class="ttname"><a href="namespaceflow_1_1error.html#a48afa7f8c2e100acd461365dfb00a114">flow::error::exec_void_and_throw_on_error</a></div><div class="ttdeci">bool exec_void_and_throw_on_error(const Func &amp;func, Error_code *err_code, util::String_view context)</div><div class="ttdoc">Equivalent of exec_and_throw_on_error() for operations with void return type.</div><div class="ttdef"><b>Definition:</b> <a href="error_2error_8hpp_source.html#l00168">error.hpp:168</a></div></div>
<div class="ttc" id="anamespaceflow_1_1error_html_aa3708bdd4ceb1a6c801f3d4a1fc10f6d"><div class="ttname"><a href="namespaceflow_1_1error.html#aa3708bdd4ceb1a6c801f3d4a1fc10f6d">flow::error::exec_and_throw_on_error</a></div><div class="ttdeci">bool exec_and_throw_on_error(const Func &amp;func, Ret *ret, Error_code *err_code, util::String_view context)</div><div class="ttdoc">Helper for FLOW_ERROR_EXEC_AND_THROW_ON_ERROR() macro that does everything in the latter not needing ...</div><div class="ttdef"><b>Definition:</b> <a href="error_2error_8hpp_source.html#l00128">error.hpp:128</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ae4dc52186797094b3040379ff19124c9"><div class="ttname"><a href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">flow::util::String_view</a></div><div class="ttdeci">Basic_string_view&lt; char &gt; String_view</div><div class="ttdoc">Commonly used char-based Basic_string_view. See its doc header.</div><div class="ttdef"><b>Definition:</b> <a href="string__view_8hpp_source.html#l00191">string_view.hpp:191</a></div></div>
<div class="ttc" id="anamespaceflow_html_a29eaaa9d0fac4ce87d8b969222dbed09"><div class="ttname"><a href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">flow::Error_code</a></div><div class="ttdeci">boost::system::error_code Error_code</div><div class="ttdoc">Short-hand for a boost.system error code (which basically encapsulates an integer/enum error code and...</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00508">common.hpp:508</a></div></div>
<div class="ttc" id="autil__fwd_8hpp_html"><div class="ttname"><a href="util__fwd_8hpp.html">util_fwd.hpp</a></div></div>
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